CN101645250B - Liquid crystal display - Google Patents

Liquid crystal display Download PDF

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Publication number
CN101645250B
CN101645250B CN2009101602820A CN200910160282A CN101645250B CN 101645250 B CN101645250 B CN 101645250B CN 2009101602820 A CN2009101602820 A CN 2009101602820A CN 200910160282 A CN200910160282 A CN 200910160282A CN 101645250 B CN101645250 B CN 101645250B
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pixel
liquid crystal
tft element
crystal cell
activation
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CN101645250A (en
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冈田元成
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Sony Corp
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Sony Corp
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G09G3/3659—Control of matrices with row and column drivers using an active matrix the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/024—Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/061—Details of flat display driving waveforms for resetting or blanking
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0261—Improving the quality of display appearance in the context of movement of objects on the screen or movement of the observer relative to the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Nonlinear Science (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The present invention provides a liquid crystal display including: a plurality of pixels each including one or more liquid crystal elements and one or more first TFT elements; a driving section performing polarity inversion driving by applying driving voltages based on an image signal to the liquid crystal element in each pixel while the driving voltages are inversely polarized; and second TFT elements controlled by the driving section. The first TFT element allows the driving voltage to be applied to the liquid crystal element in its own pixel in accordance with control by the driving section. Each of the second TFT elements allows a couple of liquid crystal elements to be electrically connected to each other. The couple of liquid crystal elements are applied with a couple of driving voltages, respectively, within a same frame period. The couple of driving voltages have inversed polarizations with each other.

Description

LCD
Technical field
The present invention relates to wherein use the LCD of TFT (thin film transistor (TFT)) element carries out image display driver.
Background technology
In the past, developed the LCD of a large amount of active array types.Recently, LCD has various application, and especially for TV, wherein pixel counts increases according to the increase of panel size and the higher sharpness of digital picture, and carries out the exploitation of the operation of higher frequency, to strengthen display performance.As a result, reduced the write time of each pixel that in the demonstration time, takies, and guaranteed that the enough time that is used to write becomes difficult.
Yet the size that only increases thin film transistor (TFT) possibly reduce the aperture ratio with the plain mode that shortens that compensates the write time, thereby causes the loss of display brightness.In addition, because owing to above-mentioned higher sharpness, pixel size are just becoming littler, so the influence of loss brightness will be more remarkable.
Therefore, proposed to reduce the write time (to realize write-in operation at high speed) of each pixel, and do not increased the size (for example, referring to Jap.P. No.3632840) of TFT as much as possible in the technology of writing fashionable precharge operation.
Summary of the invention
Yet, be applied to the electromotive force of the data line of wanting precharge pixel to be connected and equal electromotive force that other pixels that current positive service data writes are provided, and frequent different with the actual electromotive force of wanting.Therefore, in the precharge period, possibly need the adjustment of grid voltage and pulse width (grid voltage apply period) in the practice.Maybe possibly need to reduce the original write time, so that the compression precharge period makes to write necessary electromotive force amount for the pixel that will show.
The electromotive force of the pixel when as a result, the effect of precharge operation is for precharge and the influence of writing the electromotive force of fashionable pixel (influence of the electromotive force before and after the precharge) sensitivity.Therefore, effect is not necessarily stable, and depend on before with the size of afterwards the driving voltage of frame in the period.In addition, also possibly need to realize the extra drive system of such precharge operation, so driving operations maybe be complicated.What is worse, under situation about reducing as stated, can write the electromotive force of any level, but reduce so much for the period of original write time of the pixel that will show for original write time of the pixel that will show.As a result, possibly occur writing of pixel shortened, and still be difficult to solve above-mentioned driving and operational issue.
Because aforesaid shortcoming, expectation provides a kind of LCD, and it can suppress the bad influence to picture quality, and can easily realize the operation of high speed display driver.
LCD according to the embodiment of the invention comprises: a plurality of pixels with arranged, each pixel comprise one or more liquid crystal cells and an one or more TFT element; Drive part, through in the driving voltage reverse polarization, will be applied to the liquid crystal cell in each pixel based on the driving voltage of picture signal, carry out the pole reversal and drive; And the 2nd TFT element that passes through drive part control.A said TFT element allows according to the control through drive part, will be applied to the liquid crystal cell in its oneself the pixel based on the driving voltage of picture signal.Each said the 2nd TFT element allows a pair of liquid crystal cell to be electrically connected to each other, and said a pair of liquid crystal cell is applied with a pair of driving voltage based on picture signal respectively at same frame in the period.Said a pair of driving voltage has reverse each other polarity.
In LCD according to the embodiment of the invention; Driving according to a TFT element of carrying out by drive part; In the driving voltage reversed polarity,, carry out the pole reversal and drive through being applied to the liquid crystal cell in each pixel based on the driving voltage of picture signal.At this moment, the control according to the 2nd TFT element of being carried out by drive part is electrically connected to each other a pair of liquid crystal cell.Here, this is applied with a pair of driving voltage based on picture signal to liquid crystal cell respectively at same frame in period.Then, low-light level voltage is applied to liquid crystal cell.Therefore, can be applied at driving voltage before each liquid crystal cell, apply such low-light level voltage based on picture signal.In addition, different with the precharge operation of prior art, available low-light level voltage application, and before not relying on the size of afterwards the driving voltage of frame in the period.In addition, such low-light level voltage application makes the configuration of circuit or driving operations complicated hardly.
According to the LCD of the embodiment of the invention, the control according to the 2nd TFT element of being carried out by drive part is electrically connected to each other a pair of liquid crystal cell.This is black, and this is applied with a pair of driving voltage based on picture signal to liquid crystal cell respectively at same frame in period.Therefore, can be before the driving voltage that applies based on picture signal, easily apply low-light level voltage to each liquid crystal cell, and before not relying on the size of afterwards the driving voltage of frame in the period.As a result, can easily realize the operation of high speed image display driver, suppress bad influence simultaneously picture quality.
Description of drawings
Fig. 1 is the block diagram that illustrates according to the configured in one piece of the LCD of the embodiment of the invention.
Fig. 2 is the mode chart that is used to explain a reverse drive.
Fig. 3 is the circuit diagram according to the concrete configuration example of the pixel of embodiment.
Fig. 4 is the circuit diagram that is used for explaining the some reverse drive that realizes in pixel shown in Figure 3.
Fig. 5 is used to explain the sequential chart according to the image display driver of comparative example 1.
Fig. 6 is used to explain the sequential chart according to the image display driver of comparative example 2.
Fig. 7 is used to explain the sequential chart according to the image display driver of comparative example 3.
Fig. 8 is the sequential chart that is used to explain according to the problem of the image display driver of comparative example 2 and 3.
Fig. 9 is the sequential chart that is used to explain according to another problem of the image display driver of comparative example 2 and 3.
Figure 10 is the sequential chart of explanation according to the example of the image display driver of embodiment.
Figure 11 is the sequential chart of explanation according to another example of the image display driver of embodiment.
Figure 12 is used to explain the sequential chart that inserts (black display period) according to the black display of embodiment.
Figure 13 is the sequential chart of explanation according to the image display driver of modification 1 of the present invention.
Figure 14 is used to explain the sequential chart that inserts (black display period) according to the black display of modification 1.
Figure 15 is used to explain the sequential chart that inserts (black display period) according to the black display of modification 2.
Figure 16 is used to illustrate the circuit diagram according to the concrete pixel arrangement of modification 3.
Figure 17 is used to illustrate the circuit diagram according to the concrete pixel arrangement of modification 4.
Figure 18 is used to illustrate the circuit diagram according to the concrete pixel arrangement of modification 5.
Figure 19 is used to illustrate the circuit diagram according to the concrete pixel arrangement of modification 6.
Figure 20 is used to illustrate the circuit diagram according to the concrete pixel arrangement of modification 7.
Figure 21 is used to illustrate the circuit diagram according to the concrete pixel arrangement of modification 8.
Figure 22 is used to illustrate the circuit diagram according to the concrete pixel arrangement of modification 9.
Figure 23 is the mode chart that is used to explain the horizontal line reverse drive.
Figure 24 is the mode chart that is used to explain the perpendicular line reverse drive.
Figure 25 is the circuit diagram that the example of the pixel when application level line reverse drive is shown.
Figure 26 is the circuit diagram that the example of the pixel when using the perpendicular line reverse drive is shown.
Embodiment
Below will describe embodiments of the invention in detail with reference to accompanying drawing.
Fig. 1 illustrates the configured in one piece of the LCD (LCD 1) according to the embodiment of the invention.This LCD 1 comprises display panels 2, part backlight 3, image processing section 41, data driver 51, gate drivers 52, sequential control part 61 and backlight drive part 62.
Part 3 backlight is to send the light source of irradiates light to display panels 2, and for example is configured to comprise CCFL (cold-cathode fluorescence lamp), LED (light emitting diode) etc.
The light that display panels 2 sends from part 3 backlight based on driving voltage through modulation shows the image according to picture signal Din, is described below, and according to the drive signal that provides from gate drivers 52, from data driver 51 said driving voltage is provided.Display panels 2 is configured to comprise with the arranged to be whole a plurality of pixels 20.Each pixel 20 is by corresponding to the pixel of R (redness), G (green) and B (blueness) structure, the color filter of not shown R, G and B is attached on said R (redness), G (green) and the B (blueness), to send the colored display light of R, G and B respectively.
According to present embodiment, as shown in Figure 2, for example, so-called some reverse drive operation is applied to each pixel 20.That is, will be applied to the liquid crystal cell of each pixel 20 based on the driving voltage of picture signal Din, pixel ground of a pixel-by-pixel basis is with the pole reversal of driving voltage simultaneously.
Image processing section 41 produces picture signal D1 as rgb signal through the picture signal Din from external transmission being applied the Flame Image Process of appointment.
Gate drivers 52 is according to the sequential control of sequential control part 61, and the sweep trace (the following gate lines G that will describe) along not shown applies the line preface and is driven into each pixel 20 in the display panels 2.
Data driver 51 will be provided to each pixel 20 of display panels 2 based on the driving voltage of picture signal D1 from sequential control part 61.Particularly, data driver 51 produces analog picture signal (that is, above-mentioned driving voltage) through picture signal D1 being applied the D/A conversion, and analog picture signal is outputed to each pixel 20.
The bright lamp operation (light emission operation) of backlight drive part 62 controls part 3 backlight.The driving sequential of sequential control part 61 control gate drivers 52 and data driver 51, and picture signal D1 is provided to data driver 51.
Subsequently, will specify the configuration of the image element circuit that forms in each pixel 20 with reference to Fig. 3 and 4.Fig. 3 illustrates the ios dhcp sample configuration IOS DHCP of the image element circuit in the pixel 20.Reference number m in the accompanying drawing and n are respectively natural numbers, and for example pixel 20 (m, n) expression is positioned at coordinate (m, the pixel of n) locating in a plurality of pixels 20.
(m n+1) comprises the pixel circuit unit of the liquid crystal cell 22A, auxiliary capacitor element 23A and the TFT element 21A that are configured to as the main capacitance element to pixel 20.Pixel 20 (m, n+1) be connected to the pixel circuit unit that selection will drive with the line sequential mode gate lines G (n+1), will offer the data line D (m) of the pixel circuit unit that will drive based on the driving voltage of picture signal Din, as the auxiliary capacitance line Cs (n+1) of the bus that is connected to auxiliary capacitor element 23A and common connecting line Vcom.
Similarly, (m, (m+1 n+1) comprises the pixel circuit unit that disposes liquid crystal cell 22B, auxiliary capacitor element 23B and TFT element 21B to pixel 20 n+1) along gate lines G (n+1) adjacent pixels 20.(m+1 n+1) is connected to gate lines G (n+1), data line D (m+1), auxiliary capacitance line Cs (n+1) and common connecting line Vcom to pixel 20.
Liquid crystal cell 22A and 22B are as the display element of carrying out display operation (emission of display light) according to driving voltage, and said driving voltage is provided to the one of which end from data line D (m) and D (m+1) via TFT element 21A and 21B respectively.These liquid crystal cells 22A and 22B are configured to comprise unshowned liquid crystal layer and pair of electrodes, and wherein liquid crystal layer is between this is to electrode.This via tie point Pa and Pb, is connected to the source electrode of TFT element 21A and 21B and the end of auxiliary capacitor element 23A and 23B to one of electrode (or an end), and this another (other end) to electrode is connected to common connecting line Vcom.Above-mentioned liquid crystal layer disposes for example VA (vertical alignment) liquid crystal or TN (twisted nematic, twisted-nematic) liquid crystal.
Auxiliary capacitor element 23A and 23B are can stabilizing liquid crystal element 22A and the capacity cell of 22B institute charge stored, and one of which end (electrode) is connected to tie point Pa and Pb, and its other end (common electrode) is connected to auxiliary capacitance line Cs (n+1).
TFT element 21A and 21B (a TFT element) are configured to MOS-FET (mos field effect transistor); Wherein its grid is connected to gate lines G (n+1); Source electrode is connected to tie point Pa and Pb, and drain electrode is connected respectively to data line D (m) and D (m+1).These TFT element 21A and 21B are used for the driving voltage based on picture signal Din is provided to the end of liquid crystal cell 22A and 22B and the end of auxiliary capacitor element 23A and 23B as switching device.Particularly; According to via gate lines G (n+1) from the selection signal (grid voltage) that gate drivers 52 provides, optionally set up the electrical connection between the end of an end and auxiliary capacitor element 23A and 23B of data line D (m) and D (m+1) and liquid crystal cell 22A and 22B.
TFT element 24 (the 2nd TFT element) also is configured to MOS-FET, and its grid is connected to gate lines G (n), and its source electrode and drain electrode are connected respectively to tie point Pa and Pb.TFT element 24 (is for example set up each liquid crystal cell; The end of the Pa of liquid crystal cell 22A and 22B and Pb) electrical connection between; For example according to the control operation of gate drivers as shown in Figure 4 52, apply driving voltage based on the reversed polarity of picture signal Din in the period respectively to said each liquid crystal cell at same frame.Here, TFT element 24 be connected electrically in mutual pixels with different 20 (for example, pixel 20 (m, n+1) with pixel 20 (m+1, n+1)) in liquid crystal cell 22 between.In the present embodiment, optionally switch the sweep trace (gate line of the state of activation and the non-state of activation of TFT element 24; Second sweep trace) (be gate lines G (n) here also as gate line; First sweep trace), this gate line is connected to the TFT element 21 of the pixel of arranging on the sweep trace beyond the sweep trace of the pixel 20 under the TFT element 24.
Subsequently, description is about the operation and the effect of the LCD 1 of present embodiment.
At first, below referring to figs. 1 through 4 the explanation LCDs 1 main operation.
In LCD 1, as shown in Figure 1,41 couples of picture signal Din that provide from the outside carry out Flame Image Process with image processing section, and produce the picture signal D1 of each pixel 20.Picture signal D1 is provided to data driver 51 via sequential control part 61.In data driver 51, the D/A conversion is applied to picture signal D1 and produces analog picture signal.Then, operate each pixel 20, wherein from gate drivers 52 and data driver 51 outputting drive voltages with line sequential mode application point reverse drive.
Particularly; According to the selection signal that provides from gate drivers 52 via gate lines G; Switch state of activation and the non-state of activation (ON/OFF) of TFT element 21A and 21B; And optionally set up the electrical connection between data line D and liquid crystal cell 22A, 22B and capacity cell 23A, the 23B, shown in Fig. 2 and 3.Therefore, will be provided to liquid crystal cell 22A and 22B in this way from the driving voltage that data driver 51 provides based on picture signal, and the operation of carries out image display driver.
Then, between data line D and liquid crystal cell 22A, 22B and capacity cell 23A, 23B, set up in the pixel 20 that is electrically connected therein, modulate in display panels 2 from the irradiates light of part 3 backlight, and export as display light.The image of in LCD 1, carrying out based on picture signal Din thus shows.
Subsequently, compare with comparative example to 12 detailed descriptions with reference to Fig. 5 below, according to the characteristic operation and the effect of the LCD of the embodiment of the invention.Here, Fig. 5 to 7 is explanation sequential charts by the image display driver of the LCD execution of prior art, corresponds respectively to comparative example 1 to 3.Here, (A) correspond respectively to line (n), line (n+1) and line (n+2) to (C).
The simple image display driver operation of the comparative example 1 of Fig. 5 (t101 is to the sequential of t104) expression prior art.In this case; Because the increase of the pixel counts that causes owing to the more high definition of the increase of panel size and digital picture; And because be used to improve the operation of the higher frequency of display performance; The write time of each pixel that takies in the demonstration time reduces, and is difficult to guarantee the enough time that is used to write.
Yet the size that only increases the TFT element possibly reduce the aperture ratio with the plain mode that shortens that compensates the write time, thereby causes the loss of display brightness.In addition, because owing to above-mentioned higher sharpness, pixel size are just becoming littler, so the influence of loss brightness will be more remarkable.
So; In the comparative example 2 and 3 of Fig. 6 and 7 (sequential of t201) to t204 and t301 to t304; Adopted and write fashionable precharge operation,, and do not increased the size of TFT as much as possible so that reduce the write time (to realize write-in operation at high speed) of each pixel.
Yet these comparative example 2 and 3 have the problem (describing about comparative example 2 below) that is described below here.The electromotive force of the pixel when at first, the effect of precharge operation is to precharge and the influence of writing the electromotive force of fashionable pixel (influence of the electromotive force before and after the precharge) sensitivity.As a result, like for example Fig. 8 (A) with shown in electric potential difference Δ V101 (B) and the Δ V102, the preliminary filling electric weight that needs possibly depend on by before frame show the pixel electromotive force that keeps and difference.
Therefore; If being equal to or greater than, the electromotive force during precharge writes electromotive force; Then like for example Fig. 9 (A) with in the precharge period (B), possibly need the adjustment of grid voltage (reference arrow P101) and pulse width (grid voltage apply period) (reference arrow P102) in practice.
Therefore, as in the image display driver of comparative example 2 and 3 (that is, using the image display driver of precharge operation), its effect is not necessarily stable, and depend on before with the size of afterwards the driving voltage of frame in the period.In addition, also possibly need to realize the extra drive system of such precharge operation, make that driving operations maybe be complicated.
Simultaneously; According to present embodiment; According to controling of TFT element 21A that carries out by data driver 52 and gate drivers 51 and 21B; To be applied to the liquid crystal cell 22A and the 22B of each pixel 20 based on the driving voltage of the reversed polarity of picture signal Din, shown in Fig. 1 to 4, carry out a some reverse drive thus.At this moment, according to controling of the 2nd TFT element of being carried out by gate drivers 51, liquid crystal cell 22A and 22B are electrically connected to each other, and the driving voltage that applies respectively in the period based on the reversed polarity of picture signal Din in same number of frames arrives said liquid crystal cell 22A and 22B.
Under such configuration, with according to the mode application drawing that is described below of present embodiment as display driver.Here, note, when will via TFT element 24 interconnected each pixel definitions be pixel A and pixel B (for example; Pixel 20 (m; N+1) and during pixel 20 (m+1, n+1)), as being defined as V respectively about the pixel A of the relative electromotive force of reference potential and the pixel electromotive force of pixel B PAAnd V PB, the pixel electromotive force of when the operation of TFT element 24, crossing over pixel A and pixel B is defined as V AB, and the total charge dosage of pixel A and pixel B is defined as Q AB
Here, with the quantity of electric charge Q of pixel A ABe expressed as QA=α (V PA), wherein α is a capacitance coefficient, and V PAIt is the electromotive force of pixel A.Similarly, with the quantity of electric charge Q of pixel B BBe expressed as Q B=β (V PB), wherein β is a capacitance coefficient, and V PBIt is the electromotive force of pixel B.Here, because Q AAnd Q BBe the electric charge of reversed polarity each other, so Q ABSatisfy following expression formula:
Figure G2009101602820D00081
At this moment, the total charge dosage Q of interconnected pixel A and B ABCoefficient of performance γ passes through Q AB=γ V ABExpress.Therefore, when the operation of TFT element 24, cross over the pixel electromotive force V of pixel A and pixel B ABBecome fixed value.Promptly; According to controling of the TFT element of carrying out by gate drivers 51 24; Liquid crystal cell 22A and 22B are electrically connected to each other; Apply driving voltage based on the reversed polarity of picture signal Din in period respectively to said liquid crystal cell 22A and 22B in same number of frames, the low-light level voltage with fixed size is applied to liquid crystal cell 22A and 22B thus.
When the threshold voltage of the liquid crystal material of configuration liquid crystal cell 22A and 22B is defined as V ThLCThe time, following expression (1) is satisfied in expectation:
V thLC≥|V AB|...(1)
That is when, being desirably in liquid crystal cell 22A and 22B and being electrically connected via the TFT element, the electromotive force of crossing over liquid crystal cell 22A and 22B is equal to or less than the threshold voltage of the liquid crystal material of configuration liquid crystal cell 22A and 22B.
This be because, when the electromotive force of liquid crystal cell 22A and 22B is equal to or less than liquid crystal threshold voltage V ThLCThe time, they represent constant demonstration situation.Here, be equal to or less than threshold voltage V if adopt to have ThLCElectromotive force in the liquid crystal material of characteristic of constant demonstration black, then when the operation of TFT element 24, pixel 20 can typically show black.In this way, be described below and reduce the bad influence of when black display, finding in the past showing.
When satisfying above-mentioned expression formula (1), because the electromotive force before writing satisfies it typically at the threshold voltage V from the reference voltage of pixel 20 to liquid crystal material ThLCScope in requirement, so can suppress bad influence, be reduced in the load on the pixel 20 when writing simultaneously to picture quality.
Subsequently, will be with reference to the concrete example of Figure 10 explanation according to the image display driver waveform (t1 is to the sequential of t4) of present embodiment.Figure 10 is the sequential chart of expressing according to the image display driver of present embodiment.Here, (A) to (D) respectively remarked pixel 20 (m, n), 20 (m+1, n), 20 (m, n+1), 20 (m+1, drive waveforms n+1).The voltage waveform (grid voltage waveform) of expression gate lines G such as VG (n) (n) etc.; The voltage waveform (data voltage waveform) of expression data line D such as VD (m) (m) etc.; And Vcom representes the voltage (common voltage) of common electrode.The symbol of definition is used in the following description above.
At first; Pixel 20 (m like Figure 10; N+1) and 20 (m+1, arrow P 11 n+1) is with shown in the P21, TFT element 24 gets into state of activation according to the grid voltage VG (n) of gate lines G (n); And be electrically connected liquid crystal cell 22A and 22B, the driving voltage that applies reversed polarity respectively is to said liquid crystal cell 22A and 22B.Thereby cross over the low-light level voltage (low-light level voltage period or black display period) that liquid crystal cell 22A and 22B apply fixed size.
Subsequently, as the pixel 20 of accompanying drawing (m, n+1) with 20 (m+1, arrow P 12 n+1) is with shown in the P22, TFT element 21A and 21B are according to grid voltage VG (n+1) the entering state of activation of gate lines G (n+1).Then, based on the driving voltage (the voltage VD (m) of data line D (m) and D (m+1) and VD (m+1)) of picture signal Din thus write liquid crystal cell 21A and 21B, and produce pixel electromotive force V (m, n+1) and V (m+1, n+1).
That is, pixel 20 (m, n+1) with 20 (m+1, n+1) in, before the driving voltage based on picture signal Din will be provided to TFT element 21A and 21B, be electrically connected to the liquid crystal cell 22A of those pixels and the TFT element 24 of 22B and begin its operations.
Therefore, before the driving voltage that applies based on picture signal Din, can low-light level voltage (black display voltage) be applied to each liquid crystal cell 22A and 22B.Available such low-light level voltage application, and do not rely on before with the size of afterwards the driving voltage of frame in the period, this precharge operation with prior art is different.In addition, such low-light level voltage application makes the configuration of circuit or driving operations complicated hardly.
In the present embodiment, when satisfying above-mentioned expression formula (1), as long as the pixel electromotive force the during operation of TFT element 24 is equal to or less than the threshold voltage V of liquid crystal ThLC, black display is just typically available.Therefore, realize the black display insertion of each frame in the period based on such principle.
Subsequently, describe in detail about black display insertion (black display period) according to present embodiment.Figure 11 is the sequential chart of explanation according to the image display driver of present embodiment, and it is indicated to the timing waveform (t21 is to the sequential of t24) of line (n+4) through line (n).
At first, when the TFT element utilizes gate line voltage VG (n) when being in state of activation, (m n+1) becomes black electromotive force (being equal to or less than the electromotive force of the threshold value of liquid crystal) to be connected to the pixel electromotive force V of gate lines G (n+1).When TFT element 24 utilizes grid voltage VG (n) to be in not state of activation and TFT element 21 utilizes grid voltage VG (n+1) when being in state of activation; Through applying based on picture signal Din driving voltage VD (m); Pixel electromotive force V (m, n+1) become want write electromotive force (normal display time interval: Δ T1on).
In the case; Because low-light level voltage arrives these liquid crystal cells 22A and 22B to apply fixedly to be electrically connected liquid crystal cell 22A and 22B; The driving voltage that applies reversed polarity respectively is to said liquid crystal cell 22A and 22B; And because satisfy above-mentioned expression formula (1), thus pixel 20 (m n+1) becomes black display state (the black display period: Δ T2on).Therefore, for example, the black display of each frame of realization shown in figure 12 in the period inserted.
In Figure 10, be constant although the value of grid voltage VG is raised to decline from it, be not limited thereto.That is, the grid voltage that is applied to TFT element 24 can change in the activation period of TFT element 24, as the grid voltage VG ' through Figure 11 for example (n) to VG ' (n+4) shown in.
As stated; According to present embodiment; According to controling of the TFT element of carrying out by gate drivers 52 24, be electrically connected liquid crystal cell 22A and 22B, apply driving voltage based on the reversed polarity of picture signal Din in the period respectively to said liquid crystal cell 22A and 22B in same number of frames.As a result, before the driving voltage that applies based on picture signal Din, low-light level voltage easily is applied to each of liquid crystal cell 22A and 22B, and do not rely on before with the size of afterwards the driving voltage of frame in the period.The result can easily realize the operation of high speed image display driver, suppresses the bad influence to picture quality simultaneously.
Because different with the precharge operation of prior art, can change the electric capacity of liquid crystal and not rely on the electromotive force of data line D, so can suppress the bad influence to picture quality, and before the frame that writes subsequently, the substantial variations of electromotive force can be used.This can reduce is writing the quantity of electric charge of fashionable needs, thereby expansion is used for the driving surplus that when high-speed driving (driving like double-speed), writes.In addition; Because under any circumstance can stablize write performance, so can not have the flicker of the pattern that depends on shown in precharge and for the problem of the dependence of the display screen instability of picture quality of the type of display screen (as depend on).
In addition, because before the driving voltage based on picture signal Din is provided to TFT element 21A and 21B, be electrically connected to its operation of TFT element 24 beginnings of liquid crystal cell 22A and 22B in the pixel, so can the influence to display quality be reduced to minimum.
In addition, the gate line of TFT element 24 is applied voltage make the motion blur that can suppress dynamic images displayed on the screen, and keep its enough good display brightness, and do not reduce write time by the pixel 20 of TFT element 21A and 21B execution.In addition, can change the black display of each frame in the period and insert the time, and the time that does not reduce to write pixel 20.
Subsequently, adopt and explain the modification of the embodiment of the invention.Be noted that in modification identical reference number is specified and the element components identical shown in the present embodiment, and suitably the descriptions thereof are omitted.
(revising 1)
Figure 13 is the sequential chart of explanation corresponding to image display driver Figure 11, modification 1 of the foregoing description.
In this modification; The activation period of TFT element 24 changes by each sweep trace (by each horizontal pixel line); Shown in arrow P in the accompanying drawing 3 and P4; Make the low-light level voltage period (black display period) change by each sweep trace in the period in same number of frames, the said low-light level voltage period is the threshold voltage V that the electromotive force of wherein liquid crystal cell 21A and 21B is equal to or less than liquid crystal ThLCPeriod.That is, than the grid voltage VG (n) in the same at least frame under the more Zao situation that becomes off status, the rising of grid voltage waveform can be squinted arbitrarily at grid voltage VG (n+1), and that it descends is fixing.
In this way; As it is for example shown in Figure 14; Decline sequential through control gate pole tension VG (n+1) is a frame period after the decline sequential of grid voltage VG (n) only; Each frame has the different black display periods in the period black display part can be described in, and the write time of each pixel need not be changed.
Because the black display insertion period depends on the brightness of display screen and changes; Even, and keep good brightness through the lowering of luminance that wherein do not need to suppress the part that black display inserts so the display screen with high-contrast ratio also can insert and is suppressed at the motion blur in the dynamic images displayed on the screen through only in the sweep trace of needs, applying black display.
Equally, according to this modification, for example, (n) to the VG ' situation (n+4), the grid voltage that is applied to TFT element 24 can change in the activation period of TFT element 24 like the grid voltage VG ' of Figure 13.
(revising 2)
Figure 15 be explanation corresponding to the modification 1 of the foregoing description of Figure 12 and Figure 14, according to the sequential chart of the image display driver of modification 2.
In this modification, part 3 backlight is divided into each a plurality of part light-emitting block that extend in the horizontal direction.Then; Based on the drive controlling through backlight drive part 62, the brightness and the low-light level voltage period (black display period) of the irradiates light that in the position corresponding to the horizontal pixel line of carrying out black display, from the part light-emitting block of a plurality of part light-emitting blocks, sends synchronously descend.In addition, through inserting except black display each display time interval or each the demonstration time of passing through the time, will divide total irradiation light quantity of 3 to be controlled to be equal from back light part.
In this way, make brightness decline, can further strengthen through the low-power consumption of black display insertion and the improved effect of picture quality corresponding to the part backlight 3 of black display part partly through the part of inserting according to black display.
(revising 3 and 4)
Figure 16 and 17 diagrams are according to the image element circuit of the pixel 20 of modification 3 and 4.
In the modification 3 of Figure 16, the sweep trace (for example, gate lines G 2 (n+1)) that between the state of activation of TFT element 24 and non-state of activation, optionally switches is prepared with the gate line (for example, gate lines G (n+1)) that is connected to TFT element 21A and 22A dividually.
Simultaneously, in the modification 4 of Figure 17, the sweep trace that between the state of activation of TFT element 24 and non-state of activation, optionally switches is also as auxiliary capacitance line (for example, auxiliary capacitance line Cs (n+1)).
As stated, the sweep trace that between the state of activation of TFT element 24 and non-state of activation, optionally switches needn't be as the gate line (for example, like the gate lines G among the above-mentioned embodiment (n+1)) that is connected to TFT element 21A and 22A.
(revising 5-8)
Figure 18 to 21 diagram is according to the image element circuit of the pixel 20 of modification 5 to 8.Revising in 5 to 8, each pixel 20 is configured to a plurality of sub-pixels (, two subpixels) here, and it comprises liquid crystal cell 22 and TFT element 21 respectively, with the display performance of further improvement liquid crystal display.
Particularly, in the modification 5 of Figure 18, TFT element 24 is electrically connected the mutual different sub-pixel 20a of same pixel 20 and the liquid crystal cell 22 among the 20b.
In the modification 6 and 7 of Figure 19 and 20, TFT element 24 is electrically connected the sub-pixel 20a of mutual pixels with different 20 and the liquid crystal cell 22 among the 20b.
Similarly, in the modification 8 of Figure 21, TFT element 24 is electrically connected the mutual different sub-pixel 20a of same pixel 20 and the liquid crystal cell 22 among the 20b.Yet; Revising in 8, different with above-mentioned modification 5 to 7, the sweep trace that between the state of activation of TFT element 24 and non-state of activation, optionally switches (for example; Gate lines G 2 (n)) prepares dividually with the gate line (for example, gate lines G (n-1)) that is connected to TFT element 21.
Utilize such configuration, the sub-pixel that writes with opposite polarity respectively makes and possibly after the operation of TFT element 24, not obtain the pixel electromotive force in very near scope from common potential Vcom not difficultly.As a result, can under any circumstance stablize write performance, and can not have the flicker of the pattern that depends on shown in precharge and for the problem of the dependence of the display screen instability of display quality of the type of display screen (as depend on).
(revising 9)
Figure 22 diagram is according to the image element circuit of the pixel 20 of modification 9.
According to this modification, resistive element is arranged between the liquid crystal cell 21A and 21B that is electrically connected via TFT element 24 as protective element 25 (holding circuit).
In this way, but electric protection data driver 51 and gate drivers 52.
Holding circuit is not limited to resistive element, and configurable be any other protective element.
As stated,, the invention is not restricted to such embodiment and modification, but can carry out various modifications although described the present invention with reference to embodiment and modification.
For example, although the operation of some reverse drive has been described in the foregoing description etc.,, for example, it can be horizontal line reverse drive operation shown in figure 23 or perpendicular line reverse drive operation shown in figure 24.Particularly, under the situation of online reverse drive, image element circuit typically is configured to shown in figure 25.Under the situation of alignment reverse drive, image element circuit typically is configured to shown in figure 26.
In the above-described embodiments, although the pixel that comprises interconnected liquid crystal cell adjacency on left and right directions each other, they needn't adjacency, and can be positioned at the direction of the right and the left side, bottom and upper segment or inclination.
In addition, the liquid crystal cell that connects via TFT element 24 needn't physically with directly be connected, and can be electrically connected.
The application comprises and is involved on the August 4th, 2008 of disclosed theme in the japanese priority patent application JP 2008-201144 that Jap.P. office submits to, incorporates its full content by reference at this.
It will be appreciated by those skilled in the art that depending on design requirement various modifications, combination, son combination and change can occur with other factors, as long as they are in the scope of claim or its equivalent.

Claims (11)

1. LCD comprises:
A plurality of pixels with arranged, each pixel comprise one or more liquid crystal cells and an one or more TFT element;
Drive part, through in the driving voltage reverse polarization, will be applied to the liquid crystal cell in each pixel based on the driving voltage of picture signal, carry out the pole reversal and drive; And
The 2nd TFT element through drive part control;
A said TFT element allows according to the control through drive part, will be applied to the liquid crystal cell in its oneself the pixel based on the driving voltage of picture signal; And
Each said the 2nd TFT element allows a pair of liquid crystal cell to be electrically connected to each other, and said a pair of liquid crystal cell is applied with a pair of driving voltage based on picture signal respectively at same frame in the period, and said a pair of driving voltage has reverse each other polarity,
Wherein, when said a pair of liquid crystal cell was electrically connected to each other through the 2nd TFT element, the electromotive force in the said a pair of liquid crystal cell was equal to or less than the liquid crystal threshold voltage, and
The TFT element row of a series of the 2nd TFT elements of placing comprising along continuous straight runs as one man provides with the horizontal lines that comprises a series of pixels that along continuous straight runs is placed; And
Said drive part control changes the length of the activation period of the 2nd TFT element dividually for each TFT element row; Thereby at frame in the period; For each horizontal lines length of control break low-light level voltage period dividually; In the said low-light level voltage period, the electromotive force of crossing over liquid crystal cell is equal to or less than threshold voltage.
2. LCD according to claim 1 also comprises light source, its luminous liquid crystal cell in the pixel, and wherein brightness and the low-light level period from the light of light source synchronously descends.
3. LCD according to claim 1, wherein the drive part control break in the activation period of the 2nd TFT element, be applied to the grid voltage of the 2nd TFT element.
4. LCD according to claim 1, wherein
The first grid polar curve that between the state of activation of a said TFT element and non-state of activation, optionally switches is connected to a TFT element; And
Also as the first grid polar curve that is connected to the TFT element in each pixel in the horizontal lines, said horizontal lines is different with the horizontal lines of the TFT element row that belongs to corresponding to the 2nd TFT element for the second grid line that between the state of activation of said the 2nd TFT element and non-state of activation, optionally switches.
5. LCD according to claim 4; Wherein said drive part is controlled the first and second TFT elements; Make that the 2nd TFT element that is electrically connected to the liquid crystal cell of pixel begins its operation before the driving voltage based on picture signal begins to be applied to a TFT element of pixel.
6. LCD according to claim 1, wherein
The first grid polar curve that between the state of activation of a said TFT element and non-state of activation, optionally switches is connected to a TFT element; And
The second grid line and the first grid polar curve that between the state of activation of said the 2nd TFT element and non-state of activation, optionally switch provide dividually.
7. LCD according to claim 6; Wherein said drive part is controlled the first and second TFT elements; Make that the 2nd TFT element that is electrically connected to the liquid crystal cell of pixel begins its operation before the driving voltage based on picture signal begins to be applied to a TFT element of pixel.
8. LCD according to claim 1, wherein the 2nd TFT element allows the liquid crystal cell in the pixel to be electrically connected to the liquid crystal cell in another pixel.
9. LCD according to claim 1, wherein
Each pixel arrangement has a plurality of sub-pixels, and each sub-pixel comprises a liquid crystal cell and a TFT element; And
The 2nd TFT element allows the liquid crystal cell in the sub-pixel in the pixel to be electrically connected to the liquid crystal cell in another sub-pixel in the same pixel.
10. LCD according to claim 1, wherein
Pixel arrangement has a plurality of sub-pixels, and each of said a plurality of sub-pixels comprises a liquid crystal cell and a TFT element; And
The 2nd TFT element allows the liquid crystal cell in the sub-pixel in the pixel to be electrically connected to the liquid crystal cell in the sub-pixel in another pixel.
11. LCD according to claim 1, wherein
Between a pair of liquid crystal cell that is electrically connected to each other via the 2nd TFT element, the holding circuit that allows the electric protection drive part is provided.
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